Bartlett Labs: Bartlett Labs provides unique, powerful expansion devices for vintage Radio Shack TRS-80 microcomputers.

Bitchin100 DocGarden: Bitchin100 DocGarden is the site for enthusiasts to share documentation, notes, reviews and links to other projects and software related to True Portable Laptops.

Boyson Technologies: Affordable upgrades for your Tandy/Radio Shack Color Computer 1, 2, and 3.

CoCoCoding: This collection is an attempt to gather all of the documentation needed to start programming the CoCo in any given language. All of these items can be found elsewhere, but it can be difficult to sort through the many possible locations and multiple versions to find what you need. In addition to (hopefully) finding the most current versions, I've optimized the PDFs for size and readability and performed Clearscan OCR on most. Using Google Docs, these references can be quickly viewed and searched online.

CoCopedia: The Tandy/Radio Shack Color Computer Wiki.

CoCoVGA: CoCoVGA is an FPGA-based hardware enhancement for Motorola 6847 VDG-based microcomputers from the 1980s, including the early TRS-80/Tandy Color Computers. It enables VGA video output as well as a few other video improvements.

CoCo SDC: The CoCo SDC is a home-brew project for the TRS-80 Color Computer (CoCo). Darren Atkinson began development in 2009. Originally intended to just add floppy disk controller emulation to a Drivewire connection, that idea expanded over time to include emulating a floppy controller for an SD-card reader with Drivewire server access. The CoCo SDC aims to solve the compatibility problem by combining the traditional “software hook” approach with a robust emulation of the floppy controller in hardware. This dual mode implementation provides excellent performance for the majority of software which “plays by the rules” while adding a high degree of compatibility with those titles that employ floppy-based copy protection schemes or simply choose to use their own floppy drivers.

Club 100: A Model 100 User Group. Tandy/Radio Shack Models 100, 102 and 200. We call these Model “T” computers!

DriveWire 4: DriveWire 4 is an award winning open source connectivity solution for the Tandy Color Computer and similar devices. Using DriveWire 4 you can run a web server on your CoCo, host a multi line internet BBS, transfer files to and from remote computers, send email, control MIDI devices, telnet to and from your Coco, display graphical OS-9 windows on your modern PC, and much more.

Ira Goldklang's TRS-80 Revived Site: This site is devoted to providing extensive information on the line of TRS-80 personal home computers, with a specific focus on the Model I, Model III, and Model 4. There is also SOME information on the Model 100/102, Model 200, Model 600, Color Computer, and Pocket Computer lines as well as Printers. Information from these links includes product descriptions, catalog numbers, pictures, prices, operations, hardware, software, etc.

mini-MPI: At one time, Radio Shack offered a bus expansion for their Color Computer line. Called the Multi Pak Interface, these are usually referred to as MPIs by users. MPIs (of which there are several variants) all plug into the CoCo cartridge port, and provide four slots to plug in program paks, and other cart port based accessories. Several third party expansions were offered as well back in the day, and can be spotted in ads in old magazines devoted to the Color Computer. This page describes my efforts to put together a two slot MPI, for people that are looking for just one additional slot, in as compact a package as possible. Original MPIs are large and take up a lot of desk space.

NitrOS9.LCURTISBOYLE.COM: A set of Coco 1/2/3 web pages by L. Curtis Boyle.

PS/2 Keyboard to Tandy 1000A Computer Converter: I found a Tandy 1000A on eBay without a keyboard. I grew impatient and wanted to use it. So I build an adapter to use a PS2 keyboard on a Tandy 1000A.

PS2/AT Keyboard to Tandy 1000 Keyboard Adapter: Converts from AT/PS2 keyboard TO the Tandy 1000 so you can use a regular keyboard with a Tandy 1000! Should work on the Tandy 1000, 1000A, 1000SX and possibly others that use the original Tandy Keyboard. Power provided by the Tandy so you can create a cable with the Arduino in the middle.

Radio Shack Catalogs: Views on TRS-80 & Tandy Computer Catalogs.

Tandy 1000 EX/HX RAM: Expansion Board by Adrian Black. Cheap and simple, only requires 4 IC's (3 if you choose to bypass the 74LS245 with jumper links.)

Tandy 1000 Keyboard Adapter: This is an Arduino Sketch that will allow you to plug a PS/2 keyboard into an older Tandy 1000 machine with that 8-pin DIN keyboard connector.

Tandy Wiki: This is Tandy Tech, or Tandy Wiki, or TRS-80 Tech, or something. I haven't figured out the cool name yet… a place for documenting, disseminating, and collaborating to improve over time, info about TRS-80 and Tandy computers and related peripherals and subjects, in a wiki fashion.

The Half-Baked Maker: LCD replacement for TRS-80 PC-1 and Sharp PC-1211, TRS-80 PC-3 and Sharp PC-1250/-1251/-1255 pocket computers.

The Right Stuff - the TRS-80 Oldtimer Centre: Hardware support for TRS-80 Model I/III/4, Coco 1-2-3, Tandy 2000 and Tandy MS-DOS semi-compatibles and accessories.

The Zippster Zone: Welcome to the Zippster Zone. Here you will find all sorts of stuff related to my pursuit of my retrocomputing hobby featuring the Tandy Color Computer in all it’s variations. Enjoy!

TRS-80 hard drive emulator - FreHD: The project is made with these constraints in mind: Use SD-Card; Easy to build (and reproducible); Open-sourced; Easy to use.

TRS-80 Diagnostic ROM: This project was born out of a broken TRS-80 Model 3 that I was working on. I could not tell if the system was even “executing code,” so I used an early version of this ROM to help diagnose the problem. Please know that the main goal of this ROM is to test the functionality of the video RAM (VRAM) and the dynamic RAM (DRAM, system memory.) It does not test any other component unrelated to those two subsystems. If a TRS-80 has good VRAM and DRAM, it should boot into basic where you can then run further tests.

TRS‑80.org

Tvdog's Archive: A mirror of tvdog's excellent collection of Tandy and DOS Internet resources. The Tandy 1000 FAQ alone is worth its weight in gold. If you own a Tandy 1000 series machine, do not pass this up.

Voices of the past, speak up!: So, you got a broken TRS Voice Synthesizer with a defunct SC-01-A? There is hope - give it a brain, um voice transplant! The Talker/80 voice synthesizer board happily finds a home in your TRS Voice Synthesizer enclosure, and will give it back a voice in return for a home - albeit not the original voice, but a much more natural and more capable voice. Driven by the fabulous DECtalk, it can even sing “Daisy”, too!